Membrane fusion: Delta vs. other variants (IMAGE) Boston Children's Hospital Caption The Delta variant of SARS-CoV-2 fused to cell membranes far more rapidly than five other variants (Alpha, Beta, G614, Gamma, and Kappa). Credit Zhang J; et al. Science 2021 Oct 26; DOI: 10.1126/science.abl9463. Usage Restrictions No restrictions. License Public Domain Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.